A worker sent in to get someone who's not there (8)
I believe the answer is:
absentee
'get someone who's not there' is the definition.
I can't judge whether this definition defines the answer.
'a worker sent in' is the wordplay.
'worker' becomes 'bee' (a worker bee).
'in' is an insertion indicator.
'bee' placed around 'sent' is 'bsentee'.
'a'+'bsentee'='ABSENTEE'
'to' is the link.
Can you help me to learn more?
(Other definitions for absentee that I've seen before include "to prompt a hearty increase in affection!" , "are you fonder of him?" , "Someone not present" , "Bunker" , "Deserter - truant b" .)